Now that the LAA have approved the use of electronic ASI & Altimeter for backup
purposes as an alternative to steam driven instruments, I am considering
installing
a combined unit in my aircraft as a backup to my Dynon Skyview.
http://www.lightaircraftassociation.co.uk/engineering/TechnicalLeaflets/Mods%20and%20Repairs/TL%203.20%20EFIS%20in%20LAA%20Aircraft.pdf
The pre-approved one I prefer (on clarity and cost grounds) from the LAA
document
is the MGL ASX-1. However, it has one major drawback in that it does not have
a built in battery backup.
Having spoken to a distributor, he suggested a 9V PP3 battery (possibly
switchable
in the circuit) would be sufficient for emergency power if the main circuit
failed. However, I would prefer a re-chargeable battery, re-charged through
the aircraft system, so as not to have to worry or check that the backup battery
is maintained in a charged state. Despite trawling the web, and there being
several commercial units and amateur wiring diagrams out there, I have found
none that are specific for incorporating in an aircraft.
I am reasonably competent with a soldering iron, but less so in the theory of
such
things, so would be happy to construct my own on a PCB, from a detailed wiring
diagram. Does anyone know of such a diagram, or a suitable lightweight and
cost effective commercial device suitable for installation behind the Control
Panel?
I have copied this post to the AeroElectric List.
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Bob Dawson
XS TG || 912 ULS || G-NHRJ
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